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HTTP/1.1 client library
<intro stuff goes here>
<other stuff, too>
HTTPConnection goes through a number of "states", which define when a client
may legally make another request or fetch the response for a particular
request. This diagram details these state transitions:
(null)
|
| HTTPConnection()
v
Idle
|
| putrequest()
v
Request-started
|
| ( putheader() )* endheaders()
v
Request-sent
|\_____________________________
| | getresponse() raises
| response = getresponse() | ConnectionError
v v
Unread-response Idle
[Response-headers-read]
|\____________________
| |
| response.read() | putrequest()
v v
Idle Req-started-unread-response
______/|
/ |
response.read() | | ( putheader() )* endheaders()
v v
Request-started Req-sent-unread-response
|
| response.read()
v
Request-sent
This diagram presents the following rules:
-- a second request may not be started until {response-headers-read}
-- a response [object] cannot be retrieved until {request-sent}
-- there is no differentiation between an unread response body and a
partially read response body
Note: this enforcement is applied by the HTTPConnection class. The
HTTPResponse class does not enforce this state machine, which
implies sophisticated clients may accelerate the request/response
pipeline. Caution should be taken, though: accelerating the states
beyond the above pattern may imply knowledge of the server's
connection-close behavior for certain requests. For example, it
is impossible to tell whether the server will close the connection
UNTIL the response headers have been read; this means that further
requests cannot be placed into the pipeline until it is known that
the server will NOT be closing the connection.
Logical State __state __response
------------- ------- ----------
Idle _CS_IDLE None
Request-started _CS_REQ_STARTED None
Request-sent _CS_REQ_SENT None
Unread-response _CS_IDLE <response_class>
Req-started-unread-response _CS_REQ_STARTED <response_class>
Req-sent-unread-response _CS_REQ_SENT <response_class>
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aG Parses only RFC2822 headers from a file pointer.
email Parser wants to see strings rather than bytes.
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zHTTPResponse.readintoc C sp | j jtd �}t|�tkr$td��|jd�}|dkrB|d |� }y
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z HTTPResponse._get_chunk_leftc C sr | j tkst�g }y8x,| j� }|d kr(P |j| j|�� d| _qW dj|�S tk
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z HTTPResponse._readall_chunkedc C s� | j tkst�d}t|�}yvxp| j� }|d kr2|S t|�|krZ| j|�}|| | _|| S |d |� }| j|�}||d � }||7 }d| _q W W n( tk
r� tt |d|� ���Y nX d S )Nr )
rN rJ r� rv r� r, �_safe_readintorO r
�bytes)r0 r| � total_bytes�mvbrO r1 �temp_mvbr r r r~ F s&
z HTTPResponse._readinto_chunkedc C sX g }xH|dkrL| j jt|t��}|s4tdj|�|��|j|� |t|�8 }qW dj|�S )aV Read the number of bytes requested, compensating for partial reads.
Normally, we have a blocking socket, but a read() can be interrupted
by a signal (resulting in a partial read).
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bytes have been read. IncompleteRead() will be raised in this
situation.
This function should be used when <amt> bytes "should" be present for
reading. If the bytes are truly not available (due to EOF), then the
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r� )r0 r| r� r� r� r1 r r r r� u s zHTTPResponse._safe_readintor* c C s� | j dks| jdkrdS | jr(| j|�S | jdk rJ|dk sD|| jkrJ| j}y| j j|�}W n* tk
r� |dkrt� | j jd�}Y nX | r�|r�| j� n | jdk r�| jt|�8 _|S )zvRead with at most one underlying system call. If at least one
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zHTTPResponse.readlinec C sf | j � }|d ks|dkr dS d| ko.|kn s8|}| jj|�}| jt|�8 _|sbtd��|S )Nr r9 )r� rB r� rO r, r
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If there are multiple matching headers, the values are
combined into a single string separated by commas and spaces.
If no matching header is found, returns *default* or None if
the *default* is not specified.
If the headers are unknown, raises http.client.ResponseNotReady.
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zHTTPResponse.getheaderc C s | j dkrt� �t| j j� �S )z&Return list of (header, value) tuples.N)rC r �list�items)r0 r r r �
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zHTTPResponse.getheadersc C s | S )Nr )r0 r r r r� � s zHTTPResponse.__iter__c C s | j S )aj Returns an instance of the class mimetools.Message containing
meta-information associated with the URL.
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Content-Length and Content-Type).
When the method is FTP, a Content-Length header will be
present if (as is now usual) the server passed back a file
length in response to the FTP retrieval request. A
Content-Type header will be present if the MIME type can be
guessed.
When the method is local-file, returned headers will include
a Date representing the file's last-modified time, a
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containing a guess at the file's type. See also the
description of the mimetools module.
)rC )r0 r r r �info� s zHTTPResponse.infoc C s | j S )aZ Return the real URL of the page.
In some cases, the HTTP server redirects a client to another
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some cases the caller needs to know which URL the client was
redirected to. The geturl() method can be used to get at this
redirected URL.
)rT )r0 r r r �geturl s
zHTTPResponse.geturlc C s | j S )zuReturn the HTTP status code that was sent with the response,
or None if the URL is not an HTTP URL.
)rL )r0 r r r �getcode s zHTTPResponse.getcode)r NN)N���)r� r� )r� r� )r� )N)"r4 r5 r6 rU r` rm rj r^ rn rq rr rs ry ru r� r� r� rx r~ rz r� r� r� r; r� r� r� r� r� r� r� r� r� �
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In a connection that uses HTTP CONNECT tunneling, the host passed to the
constructor is used as a proxy server that relays all communication to
the endpoint passed to `set_tunnel`. This done by sending an HTTP
CONNECT request to the proxy server when the connection is established.
This method must be called before the HTML connection has been
established.
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with the CONNECT request.
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